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Title

Range and patterns of Great Bustard (Otis tarda) movements in Villafáfila, NW Spain

AuthorsAlonso López, Juan C. ; Alonso López, Javier A.; Martín, Enrique; Morales, Manuel B.
KeywordsDispersal
Great Bustard
Movements
Issue Date1995
PublisherSociedad Española de Ornitología
CitationArdeola, 42(1):69-76 (1995)
Abstract[EN] We studied the range of juvenile dispersal and adult seasonal movements in the Great Bustard (Otis tarda) population of Villafáfila Reserve, NW Spain, using data from censuses and individual marking between 1983 and 1994. Thirty birds (22 males, 8 females) of those marked as young were seen during their juvenile dispersal outside the Reserve, at distances of up to 63 km, preferentially northeastwards, over an area of 2800 km2. All males and 40% of females abandoned the Reserve during their juvenile dispersal. About half the males born in the Reserve never returned to it as breeding adults, while all females returned. With respect to seasonal movements of adults, about 40% of females wintering in the Reserve abandoned it during the spring-summer to nest, most of them returning in October. A 20-30% of the males present at the display arenas in early spring only entered the Reserve during the exhibition and copulatory phase. About half the males present at that time abandoned the Reserve once the peak copulation period was over, remaining at up to 20 km of the display arenas during the summer. The observed dispersal patterns are discussed in relation to current conservation policy of the species in the region of study.
[ES] Extension y patrones de movimientos de las Avurardas (Otis tarda) de Villafafila. Se estudiaron la amplitud y los patrones de movimientos de las Avutardas (Otis tarda) de la Reserva de Villafafila, a partir de datos de censos y marcaje individual durante 1983-94. Treinta individuos (22 machos, 8 hembras) de los marcados como pollos fueron vistos durante su dispersion juvenil fuera de la Reserva, a distancias de hasta 63 km, preferentemente hacia noreste, siendo la superficie cubierta por dichos contactos de unos 2800 km2. Todos los machos y el 40% de las hembras abandonaron la Reserva durante su dispersion juvenil, regresando posteriormente alrededor de la mitad de los machos y todas las hembras. En cuanto a los movimientos estacionales de los adultos, aproximadamente un 40% de las hembras que pasan el invierno en la Reserva la abandonan para nidificar, volviendo a ella en su mayoria en octubre. Un 20-30 % de los machos presentes en las zonas de exhibicion y copula durante la primavera temprana viven fuera de la Reserva durante el resto del año. Alrededor de la mitad de los machos la abandonaron al concluir el periodo de copulas, estableciendose a distancias de hasta 20 km durante el verano. Se discuten los patrones de dispersion observados en relacion con el estado de conservacion actual de la poblacion de Avutardas de la Tierra de Campos.
Description8 paginas y 2 figuras
Publisher version (URL)http://www.ardeola.org/files/294.pdf
URIhttp://hdl.handle.net/10261/76770
ISSN0570-7358
Appears in Collections:(MNCN) Artículos
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